OpenACC 3.3 section 2.9.8 says: "...where each tile size is a constant positive integer expression or an asterisk".
However, every use of tile in kernels_loop_tile.c/.cpp on line ~68 uses 'n', which is not defined as a constant, just as a global variable.
Not sure what you wish to do here, but if you give guidance, I can submit a patch.
Marking it 'const' or 'constexpr' would obviously work in C++, but this obviously doesn't work in C.